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Composites based on polyphtalamides matrices and continuous glass fibers: structure-processing and properties relationships
International Journal of Material Forming ( IF 2.4 ) Pub Date : 2020-05-20 , DOI: 10.1007/s12289-020-01564-x
M. Yousfi , M. Dkier , M. Colella , K. Lamnawar , A. Maazouz

Continuous Glass Fiber-Reinforced Thermoplastic Composites (GFRTC) were successfully prepared using two different routes: a reactive laboratory-created approach as well as a compression molding method. Two kinds of high-performance polyphtalamides (PPA) were studied: PPA from a chain extension reaction of its parent prepolymer (named R-PPA) in comparison with a virgin non-reactive PPA (NR-PPA). For the former, the chemo-rheological behaviors were investigated by coupling rheology with fast-scan and high temperature Fourier Transform InfraRed (FTIR) measurements. Interestingly, it was demonstrated that a maximum chain extension conversion could be obtained in a few minutes. Moreover, elevated molar masses could be reached with broad polydispersities. For thermo-compression forming process, and despite the moderate NR-PPA viscosity, it was therefore possible to obtain a good impregnation of the GFRTC with improved mechanical properties. By a subsequent thermal post-treatment, a correlation between the obtained highest glass transition temperatures (Tg), molar masses and induced crystallinities on thermomechanical properties could be emphasized. The present study thus highlights some interesting results to obtain structural heat-resistant GFRTC materials typically used in the field of aerospace and automotive parts intended especially for high service temperature applications.



中文翻译:

基于多邻苯二甲酰胺基体和连续玻璃纤维的复合材料:结构加工与性能的关系

连续玻璃纤维增​​强热塑性复合材料(GFRTC)使用两种不同的途径成功制备:一种由实验室创建的反应性方法以及一种压模方法。研究了两种高性能的多邻苯二甲酰胺(PPA):与原始的非反应性PPA(NR-PPA)相比,其母体预聚物(称为R-PPA)的扩链反应产生的PPA。对于前者,通过将流变学与快速扫描和高温傅立叶变换红外(FTIR)测量耦合来研究化学流变行为。有趣的是,证明了可以在几分钟内获得最大的扩链转化率。而且,在宽的多分散性下可以达到提高的摩尔质量。对于热压成型工艺,尽管NR-PPA粘度适中,因此,可以得到具有改善的机械性能的良好浸渍的GFRTC。通过随后的热后处理,可以强调所获得的最高玻璃化转变温度(Tg),摩尔质量和诱导的结晶度之间的热机械性质之间的相关性。因此,本研究强调了一些有趣的结果,以获得结构耐热的GFRTC材料,这些材料通常用于航空航天和汽车部件领域,尤其是用于高工作温度的应用。

更新日期:2020-05-20
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